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MELSEC-Q
APPENDIX
Appendix 2.2 Using Programs Designed for the QC24 (N) and Installing the Q Series C24
into Existing Systems
This section explains how to use programs designed for serial communication modules
in the QnA series and the installation of the Q series C24 into an existing system.
POINT
When using the Q series C24, make sure to set the operation mode, station
number, and transmission specifications with the following parameter setting
screen of GX Developer.
• "Intelligent function module switch setting" screen
The Q series C24 does not have the setting switches to set the operation mode,
station number, and transmission specification that are available in the serial
communication modules for QnA series.
Appendix 2.2.1 Using programs designed for the QC24 (N)
The data communication between the QnACPU and external devices as well as other
QnACPU which has been performed by QC24(N) can also be performed by the Q
series C24.
The following explains how to use programs designed for QC24(N) during data
communication using the Q series C24.
(1) The communication programs directed to the QC24(N) on the external device side
and the communication programs on the QnACPU (self-station) side to which the
QC24(N) is mounted can be used for the Q series C24.
However, note the following points.
• There is no function that allows data communication with other station's PLC
CPUs by a data link instruction.
Delete the part of data communication program by data link instructions.
• When using a new function, create a new program.
(2) Make sure to check operation when using communication programs for QC24(N)
on the external device side and the QnACPU (self-station) side.
(3) The notes during data communication by RS-422/485 interface also apply to the Q
series C24.
• Take measures against data error reception on the external device side (see
Section 3.3.3).
• Operation of RS-422/485 interface on the PLC side.